package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录功能
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用wx服务器的接口获取当前用户的openid  https://api.weixin.qq.com/sns/jscode2session
        String openid = getOpenId(userLoginDTO.getCode());

        //检验是否获取到 空表示获取失败 抛出业务异常
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);

        //如果是新用户 自动完成注册
        if(user==null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);//完成注册（放入数据库）
        }

        //返回用户对象
        return user;
    }

    /**
     * 调用微信接口服务 获取openid
     * @param code
     * @return
     */
    private String getOpenId(String code){
        //怎么调用获得？httpclient！！
        Map<String, String> map=new HashMap<>();//要四个参数 appid、secret、jscode、grant_code 微信官方文档
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);//将接收到的json字符串封装成一个jsonobject对象
        String openid = jsonObject.getString("openid");//获取微信用户的openid
        return openid;
    }

}
